404481656221 has 2 divisors, whose sum is σ = 404481656222. Its totient is φ = 404481656220.

The previous prime is 404481656207. The next prime is 404481656231. The reversal of 404481656221 is 122656184404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404152632900 + 329023321 = 635730^2 + 18139^2 .

It is a cyclic number.

It is not a de Polignac number, because 404481656221 - 2³³ = 395891721629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404481656231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202240828110 + 202240828111.

It is an arithmetic number, because the mean of its divisors is an integer number (202240828111).

Almost surely, 2^404481656221 is an apocalyptic number.

It is an amenable number.

404481656221 is a deficient number, since it is larger than the sum of its proper divisors (1).

404481656221 is an equidigital number, since it uses as much as digits as its factorization.

404481656221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 404481656221 in words is "four hundred four billion, four hundred eighty-one million, six hundred fifty-six thousand, two hundred twenty-one".